Why is the yellow waist?

Yellow waist willow yingxing is caused by disease.It is usually cage, but do not tie lines, which will increase the fear of birds, and even refuse to eat death.Usually use white aphids to open food, then change food in a few days, change the powder first, and then change the particles. At the same time, some high -calorie foods should be added. Because this bird is more afraid of cold, it must beKeep warmth measures.